[gnumeric] Configure: why are we checking for flex when we don't use it?

[Morten Welinder <mortenw src gnome org>]

commit d7784c917d3e230025ced72dc1e3bc42aad7a597
Author: Morten Welinder <terra gnome org>
Date:   Tue Feb 2 15:12:14 2016 -0500

    Configure: why are we checking for flex when we don't use it?

 configure.ac |    5 -----
 1 files changed, 0 insertions(+), 5 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 8959c7a..e18211e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -89,11 +89,6 @@ if test "x$ac_cv_prog_YACC" = x; then
        AC_MSG_ERROR([*** bison or equivalent is required])
 fi
 
-AM_PROG_LEX
-if test "x$ac_cv_prog_LEX" = x; then
-       AC_MSG_ERROR([*** flex or equivalent is required])
-fi
-
 AC_PROG_LN_S
 AC_HEADER_STDC